Nathan Speed 2 Waistpack with Two 10-Ounce Nutrition Flasks Hydration belt with 2 10 oz/300ml flasks for a total of 20 oz/600ml hydration Limited-stretch, ultra-soft Velcro closure belt stays bounce-free Molded holsters with flasks guarantee one-handed, on the fly access Enhanced, elasticized limited stretch belt with ultra soft perimeter binding Updated feather light pocket fabrication reduces weight and maintains durability